Viewing archive of Sunday, 21 December 1997
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 1997 Dec 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 355 Issued at 2200Z on 21 DEC 1997IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z
SOLAR ACTIVITY WAS LOW. TWO UNCORRELATED C-CLASS EVENTS
OCCURRED DURING THE REPORTING PERIOD, THE FIRST A C7 FLARE AT
21/0354Z, AND THE SECOND A LONG DURATION C2 EVENT AT 21/1645Z. THE
MOST PROBABLE GENERATOR OF THESE FLARES IS REGION 8124 (S22E66),
A 7-SPOT 'EAO' BETA GROUP. THE ONLY OTHER ACTIVE REGION CURRENTLY ON
THE VISIBLE DISK, REGION 8123 (N18W36), HAS BEEN QUIET WHILE DECAYING
INTO A 3-SPOT 'CSO' BETA.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW, DUE TO THE HIGH PROBABILITY FOR CONTINUED C-CLASS ACTIVITY FROM
REGION 8124.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET AT ALL LATITUDES FOR THE PAST 24
HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET, WITH THE CHANCE FOR ISOLATED PERIODS OF
UNSETTLED CONDITIONS, FOR THE NEXT THREE DAYS.
III. Event Probabilities 22 DEC to 24 DEC
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 DEC 092 Predicted 22 DEC-24 DEC 092/092/094 90 Day Mean 21 DEC 093
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 DEC 003/002 ESTIMATED AFR/AP 21 DEC 004/003 PREDICTED AFR/AP 22 DEC-24 DEC 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 22 DEC to 24 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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